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參數(shù)資料
| 型號： | EL8170ISZ-T7 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 3/13頁 |
| 文件大小： | 0K |
| 描述： | IC AMP INST SGL R-R MCRPWR 8SOIC |
| 標準包裝： | 1 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 0.55 V/µs |
| -3db帶寬： | 192kHz |
| 電流 - 輸入偏壓： | 700pA |
| 電壓 - 輸入偏移： | 50µV |
| 電流 - 電源： | 65µA |
| 電流 - 輸出 / 通道： | 32mA |
| 電壓 - 電源，單路/雙路(±)： | 2.4 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOIC |
| 包裝： | 剪切帶 (CT) |
| 產(chǎn)品目錄頁面： | 1234 (CN2011-ZH PDF) |
| 其它名稱： | EL8170ISZ-T7CT |
EL8170, EL8173
11
FN7490.7
October 15, 2013
Input Bias Cancellation, Input
Bias Compensation
The EL8170 and EL8173 are features an Input Bias Cancellation
and Input Bias Compensation Circuit for both the input and
feedback terminals (IN+, IN-, FB+ and FB-), achieving a low input
bias current all throughout the input common-mode range and the
operating temperature range. While the PNP bipolar input stages
are biased with an adequate amount of biasing current for speed
and increased noise performance, the Input Bias Cancellation and
the Input Bias Compensation Circuit, sinks most of the base
current of the input transistor leaving a small portion as input bias
current, typically 500pA. In addition, the Input Bias Cancellation
and Input Bias Compensation Circuit, maintains a smooth and flat
behavior of the input bias current over the common mode range
and over the operating temperature range. The Input Bias
Cancellation and Input Bias Compensation Circuit, operates from
the input voltages of 10mV above the negative supply to the input
voltages slightly above the positive supply. See “Average Input Bias
Current vs Common-Mode Input Voltage” in the “Typical
Performance Curves” beginning on page 4.
Output Stage and Output Voltage Range
A pair of complementary MOSFET devices drives the output VOUT
to within a few millivolts of the supply rails. At a 100k
Ω load, the
PMOS sources current and pulls the output up to 4mV below the
positive supply, while the NMOS sinks current and pulls the
output down to 4mV above the negative supply, or ground in the
case of a single supply operation. The current sinking and
sourcing capability of the EL8170 and EL8173 are internally
limited to 26mA.
Gain Setting
VIN, the potential difference across IN+ and IN-, is replicated (less
the input offset voltage) across FB+ and FB-. The objective of the
EL8170 and EL8173 in-amp is to maintain the differential
voltage across FB+ and FB- equal to IN+ and IN-; (FB- - FB+) =
(IN+ - IN-). Consequently, the transfer function can be derived.
The gain of the EL8170 and EL8173 is set by two external
resistors, the feedback resistor RF, and the gain resistor RG.
to GND. With this configuration, Equation 1 is only true for a positive
swing in VIN; negative input swings will be ignored and the output
will be at ground.
Reference Connection
Unlike a three op amp instrumentation amplifier, a finite series
resistance seen at the REF terminal does not degrade the
EL8170 and EL8173's high CMRR performance, eliminating the
need for an additional external buffer amplifier. The circuit shown
in Figure 38 uses the FB+ pin as a REF terminal to center or to
adjust the output. Because the FB+ pin is a high impedance
input, an economical resistor divider can be used to set the
voltage at the REF terminal. The reference voltage error due to
the input bias current is minimized by keeping the values of the
voltage divider resistors, R1 and R2, as low as possible. Any
voltage applied to the REF terminal will shift VOUT by VREF times
the closed loop gain, which is set by resistors RF and RG
according to Equation 2. Note that any noise or unwanted signals
on the reference supply will be amplified at the output according
to Equation 2.
The FB+ pin can also be connected to the other end of resistor,
and EL8173 in-amps maintain constant differential voltage
across the input terminals and feedback terminals
(IN+ - IN- = FB+ - FB-), the transfer function of Figure 39 can be
and susceptibility to external noise is reduced.
1
3
2
8
5
4
7
6
+
-
+
-
IN+
IN-
FB+
FB-
V+
V-
+2.4V TO +5.5V
RF
RG
VOUT
EL8170,
VCM
VIN/2
FIGURE 37. GAIN IS SET BY TWO EXTERNAL RESISTORS, RF
AND RG
EL8173
V
OUT
1
R
F
R
G
--------
+
V
IN
=
(EQ. 1)
V
OUT
1
R
F
R
G
--------
+
V
IN
()
1
R
F
R
G
--------
+
V
REF
()
+
=
(EQ. 2)
FIGURE 38. GAIN SETTING AND REFERENCE CONNECTION
1
3
2
8
5
4
7
6
+
-
+
-
IN+
IN-
FB+
FB-
V+
V-
+2.4V TO +5.5V
RF
RG
VOUT
EL8170,
VCM
VIN/2
REF
+2.4V TO +5.5V
R1
R2
EL8173
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EL8171 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifiers |
| EL8171_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifiers |
| EL8171_07 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifiers |
| EL8171FSZ | 功能描述:儀表放大器 EL8171FSZ MICROPWR SINGL SUPY R2R I/O RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| EL8171FSZ-T7 | 功能描述:儀表放大器 EL8171FSZ MICROPWR SINGL SUPY R2R I/O RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
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